To determine the number of atoms in one mole of MgCl2 (magnesium chloride), you can use Avogadro's number, which is approximately 6.022 x 10^23 atoms/molecules per mole.

First, you need to calculate the molar mass of MgCl2.

Magnesium (Mg) has an atomic mass of approximately 24.31 g/mol.

Chlorine (Cl) has an atomic mass of approximately 35.45 g/mol (rounded to two decimal places).

Now, add the atomic masses of one magnesium atom and two chlorine atoms to find the molar mass of MgCl2:

MgCl2 molar mass = (1 x Mg atomic mass) + (2 x Cl atomic mass)

MgCl2 molar mass = (1 x 24.31 g/mol) + (2 x 35.45 g/mol)

MgCl2 molar mass = 24.31 g/mol + 70.90 g/mol

MgCl2 molar mass = 95.21 g/mol

So, the molar mass of MgCl2 is approximately 95.21 g/mol.

Now, using Avogadro's number, you can calculate the number of atoms in one mole of MgCl2:

Number of atoms in 1 mole of MgCl2 = 6.022 x 10^23 atoms/molecules per mole

Now, divide this by the molar mass of MgCl2 (95.21 g/mol):

Number of atoms in 1 mole of MgCl2 = (6.022 x 10^23 atoms/mol) / (95.21 g/mol)

Number of atoms in 1 mole of MgCl2 ≈ 6.32 x 10^21 atoms

So, there are approximately 6.32 x 10^21 atoms in one mole of MgCl2.

Acid +Alkali = Salt + water.

Symbolically

H^+(aq) + OH^-(aq) = H2O(l)

A prime example is

HCl(aq) + NaOH(aq) = NaCl(aq) + H2O(l)

Other neutralisation reactions are

Acid + Base = salt + water

Acid + Carbonate = salt + water + carbon dioxide.

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MAAL

Apostrophe.

displacement of people

It is usually a chemical change.

Calpol is used to cure babies and children of aches and pains, congestion, cough, cold and flu, sore throat and teething pain, mumps, measles, fever, post immunisation fever.

True

Oxygen is the gas that is required for respiration.

Mercury is a metal element which is liquid at room temperature

Rarefaction

17. What is known as universal solvent because it can more dissolve solutes than any other liquids?

a. Water b. Alcohol c. Kerosene d. Gasoline

pretty much everything

your body etc.

London docklands changed because modern ships are too large to enter the old Victorian docks so container ships have had to use purpose built facilities away from London. The Docklands area of East London is now occupied by residential and office accommodation and some light industry.

There are many factors like the genes, dna etc. Also the attitude and thinking changes from person to person.

It is a physical change.

Isotopes have the same numbers of protons but different numbers of neutrons. One of the most common examples is carbon: C12 is the standard carbon atom, but C13 and C14, although still carbon atoms, have one or two extra neutrons.

This is the element Carbon.

Carbon has three isotopes, of which carbon -12 is the most common.

It is composed of : -

C-12 ; 6 protons, 6 neutrons, ( 6+6 = 12) and 6 electrons.

The other isotopes of carbon are#

C-13 ; 6 protons, 7 neutrons, ( 6+7=13) and 6 electrons

C-14 ; 6 protons, 8 neutrons, (6+8=14) and 6 electrons.

"van der waals" forces.

Water is great example of one.

to keep you hydrated and keep your body functioning seen as most of you is water..

Soap bubbles are affected by gravity by: Gravity pulls the soap bubble down into forming a cone shaped bubble at the end.

they are same